arrayname: original
Taxonomy
Original description: "Test very low trochospiral, nearly planispiral in appearance, slightly depressed spirally, outline ovate, equatorial periphery strongly lobulate. Wall strongly hispid and finely perforate. Chambers 5 to 6 1/2 in the final whorl, increasing gradually in size, inflated, spherical to subspherical; about two whorls. Sutures almost radial, depressed both spirally and umbilically. Umbilicus wide and shallow. Primary aperture a low arch, interiomarginal, umbilical-extraumbilical, extending halfway onto the equatorial periphery, with a broad lip extending into the umbilicus if well preserved. Greatest diameter is about 0.22 mm."
Entries in the Catalog of original descriptions: Hedbergella atlantica, Hedbergella lata
Character matrix
test outline: | Lobate | chamber arrangement: | Planispiral | edge view: | Compressed | aperture: | Umbilical-extraumbilical |
sp chamber shape: | Inflated | coiling axis: | Very low | periphery: | N/A | aperture border: | Thin lip |
umb chbr shape: | Inflated | umbilicus: | Narrow | periph margin shape: | Broadly rounded | accessory apertures: | Relict |
spiral sutures: | Strongly depressed | umb depth: | Deep | wall texture: | Mod. Pustulose | shell porosity: | Finely Perforate: 1-2.5µm |
umbilical or test sutures: | Strongly depressed | final-whorl chambers: | 5-6.5 | N.B. These characters are used for advanced search. N/A - not applicable |
Geological Range:
Last occurrence (top): within R. calcarata zone (75.06-75.91Ma, top in Campanian stage). Data source: [copied from Chronos database]
First occurrence (base): within D. asymetrica zone (83.65-85.60Ma, base in Santonian stage). Data source: [copied from Chronos database]
Plot of range and occurrence data:
Petters, S. W. (1977). Upper Cretaceous planktonic foraminifera from the subsurface of the Atlantic Coastal Plain of New Jersey. Journal of Foraminiferal Research. 7(3): 165-188. gsReferences:
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Muricohedbergella atlantica compiled by the pforams@mikrotax project team viewed: 22-4-2025
Short stable page link: https://mikrotax.org/pforams/index.php?id=110361 Go to Archive.is to create a permanent copy of this page - citation notes |
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